Live insect id? Does anyone know where to send them?

Hey guys, I'm sure there's someone out there that's sent out some bugs for an id and I would really appreciate it if someone could suggest where I could send them out and what it will cost. I changed the bedding in the spider tank last week and also got some new house plants that are by her tank and this week i noticed hundreds of brownish red mites everywhere, I have no idea what they might be or if they're harmful, I'm working on getting rid of them now. I don't think they look like snake mites, they're much bigger and lighter but I have to know for sure what they are so I really need to get some id'd they're to small for pictures so I need to send them in somewhere. I would really appreciate some help, thank you!